Brake



May -1 #2. s'. SANFORD";

V BRAKE I Filed Mrch 21, 1928.

- IHVEHTOR Rag/5.5arzford ATTORNEY Patented May 20, 1930 2 UNITED. s ATEs 1 ROY s. saNroRn, or SDUTH BEND, INDIANA, Ass enoia 'ro BENDIX BRAKE COMPANY;

' or SOUTH iBENn, mnm van CORPORATION or ILLINOIS BRAKE This invention relates to brakes, and is I illustrated as embodied in an interna1 expanding automobile brake. An object of the invention is to permit'a shoe,'or one of a 5 pair of shoes or the like friction devices, to

adjust its position to compensate for wear pivotally mounting it on means-such as a p1voted rigid compression link, for example by ing, in which: v v. v

Figure 1 1s a v1ew showing the brake 1n frictionally clamping the shoe to the link ad- 10 jacent the center of the shoe. In embodying .the invention in a connection between two shoes, the above-described link is arranged to operate the second shoe, which is illus; trated as one of the anchored shoes of athreeshoe brake.

''The above and other objects and features of the invention, including various novel combinations of parts and desirable details". of construction, will be apparent from the following description of one illustrative embodimentshown in the accompanying drawvertical section, just inside the head of the brake drum, with thebrake shoes in side elevation, and also showing part of the operat ing'mechanism in side elevation; and

Figure 2 is a partial section, on the line 22 of Figure 1, through the means con necting the shoe and link.

The illustrated brake mechanism'includes a rotatable brake drum 10, at the open side of. which is a backing plate or other support- 12, and within which is arranged novel frie tion means such as three brake shoes14, 16,- and 18 operated by anapplying device such' as a cam 20. Cam 20 is shown integral with a shaft ournaled in a bracket carried by the backing plate 12, and havingjan arm 22 con "stainpings formin at the lower end of '16, thus in effect causing these two shoes to a ine-anon filed March 21, 1925. ,Serial no. 263,404.

are built up'of L-section stampings riveted or welded back to back and carrying suitable brake lining, as shown in Figure 2. The shoe 18 are spread apart the shoe, to straddle shoe overlap, 4 7

Shoes 16 and 18 are preferably anchored on pivots 4t) and '42 carried by the backing plate 12. The brake is applied'b'y means of cam'20 or its equivalent spreading ,shoesfil4 and 18apart against the resistance of a return spring 44, and shoe 16 is applied by shoe 1-4 against the-resistance of an auxiliary return spring 46. An eccentricadjustable stop'48'engaging the unanchored end of shoe 16 servest'o determine the released position of that shoe. Y According'to an important feature of the present invention, .the connection between shoes 14 and 16' includes one or-a pair of compression links freely connected to an intermediate portion of shoe 16. by a pivot their opposite ends, the central stiffening web of shoe 14, preferably adjacent its center. The links are connected to shoe 14 by means such as a pivot orbolt 54, illustrated as havingat one end a nut 56 compressing a coil spring 58' urging friction washers 60 against opposite sides of the shoe stiffening web. These parts constitute friction means clamping the shoe to the links, and permitting the shoe to turn with respect to the links when the brake .is applied, to compensate au.- tomatically for wear, while preventing the shoe from turning at all other times;

While one illustrative embodiment of the invention has been described in detail, it is 'notmy intention to limit'the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim: I

1. A brake comprising a pair of rigid shoes arranged end to end, in combination with a rigid link freely pivoted to one shoe and frictionally clamped to the other shoe.

2. "A brake comprising a pair'of rigid shoes arranged end to end, in combination with a -.52. These links embrace betweenthem, at i signed my name.

rigid link freely pivoted to one shoe and frictionally pivoted to theother shoe. 3. A brake comprising, in combination,

three shoes arranged end to end, anchoring means engaging adjacent ends of two of the shoes, a compression link pivotally connected to one of the anchored shoes and frictionally clamped to the third shoe, and applying means acting on said third shoe and. on other of the anchored shoes. v

4. A brake comprising in combination, a drum, a friction device engageable with the drum, brake operating means constructed the.

and arranged to contact said friction device at one end thereof, and a swinging rigid link pivotally mounted at one end and frictionally clamped to' said friction device at its other end.

5. A brake comprising in combination, .a drum, a friction device engageable with the drum, means for actuating the friction device, said means acting on a portion of the device remote from the central portion there of together with anchor means for taking the thrust of said friction device, said anchor means being so connected to said device as to move therewith as a unit during the releasing movement of the brake and yet being capable of relative angular movement with respect thereto during the-application of the brake.

In testimony whereof, I have hereunto ROY ssA FonD. 

